Burr-freebolt forging mould

ABSTRACT

A positive extractor ensuring pressing of the bolt shaft belonging to the bolt draft with the force applied on Y-axis after reaching to upper head connection block, the bolt die module having the die connection block enabling connection of aforementioned positive extactor, and characterized with, containing the die having the die hole centered with the die connection block on aforementioned y-axis, different forms of brand die centered within the upper head connection block enabling burr-free production during shaping and enabling forming the pressed bolt shaft in different head shape, containing different forms of head die placed between different die and different forms of brand die.

CROSS-REFERENCE TO RELATED U.S. APPLICATIONS

Not applicable.

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

Not applicable.

NAMES OF PARTIES TO A JOINT RESEARCH AGREEMENT

Not applicable.

REFERENCE TO AN APPENDIX SUBMITTED ON COMPACT DISC

Not applicable.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a manufacturing method where steelbolts are pressed and head form is hot forged without creating anyburrs.

The present invention relates to a manufacturing method that eliminatesthe undesired excess metal that form following the hot forging, referredto as burr, which are removed in an additional operation called trimmingon a separate workbench, using the steel rods cut to a certain lengthand one end heated.

2. Description of Related Art Including Information Disclosed Under 37CFR 1.97 and 37 CFR 1.98

Steel bolts are mechanical fastening parts that are widely used inalmost all fields and manufactured in fairly large volumes. Even smallreductions from the manufacturing and transfer costs result in greatsavings. Likewise, small costs and small losses of time add up to greatadditional costs. This makes the factors of time, material and laborindispensable factors in steel bold manufacturing.

In steel bolt manufacturing using the former technique, burrs form atthe bolt head section. This results in undesired excess metal formation,which in turn increases the material costs in steel bold manufacturing.

The technique, in the current situation, involves formation of excessmetal, which has to be removed on a separate workbench in an additionaloperation step. This brings about the requirement of additional laborforce and additional workbench to carry out this operation step.

Moreover, scrap costs in addition to labor costs as well asmanufacturing times increase with the additional work of removing excessmetal.

Today's friction presses that are employed to manufacture steel bolts byhot forging bolt heads consist of die to give the bolt various headforms and brand imprinter, as a single unit, and bolts are manufacturedby forging this way, and then left to cool. In the current open diemethod, undesired burr of thickness of 2-3 mm, form during the forgingbetween the surfaces where the lower die and upper die merge. Therequirement of removing this burr increases labor costs, scrap costs aswell as manufacturing times.

Literature researches show us various structures pertaining to theaforementioned bolt manufacturing methods. Utility model withapplication number 2005/04964, titled “Fastening Component ManufacturingSystem” is one of these methods. The mode summary reads: “Head form,subject to the utility model, a method of manufacturing bolts, screws,rivets, and other similar fastening parts using eccentric presses andpertaining system, consists of four assemblies, namely a conical formingassembly, bolt head preliminary forming assembly, reduction assembly andburr-free cutting assembly. In this method, one end of the coil shapedmaterial is subjected to forming in a forming assembly, then conicshaped head section is forged to shape in preliminary forming assemblyand then the section of material body where the threads will be made isbrought to rubbing diameter in reduction assembly. Head section of thematerial whose body section is in rolling diameter is given its finalform in burr-free cutting assembly”.

Too many process have been used in the aforementioned application whichincreases the manufacturing costs, aforementioned application is anexample of certain disadvantages mentioned above.

Consequently, certain improvements are made in parallel to the advancingtechnology in bolt manufacturing methods, and therefore, new structuresare needed to eliminate the disadvantages mentioned above and to bringsolutions to existing systems.

BRIEF SUMMARY OF THE INVENTION

The present invention relates to hot forging method that meets all theaforementioned requirements, by eliminating all of the disadvantages andbrings certain additional advantages, and related with burr-free bolthead manufacturing.

The purpose of the present invention is to eliminate the need for anadditional machinery to be used for trimming operation to be carried outon eccentric press as a second operation following the forging as wellas manufacturing or procurement of burr removal dies suitable for thebolt, and the labor force required for the aforementioned operationstep.

Another purpose of the present invention is to eliminate the labor costand time required for transporting to burr removal eccentric press ofthe bolts, manufactured with burrs and kept in a separate section formany hours in order for them to cool.

On the other hand, the present invention aims to eliminate by 2-5%material scraping that occur due to manufacturing of bolts with burrs.

Another purpose of the present invention is to eliminate cut marksbecause there is no cutting on the bolt head, which gives the bolts ahigher quality look.

Yet another purpose of the present invention fabrication operation timeand delivery time are reduced because one operation step is eliminatedin bolt manufacturing, which results in lower bolt unit prices.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

FIG. 1 is a perspective drawing of bolt die module subject to thepresent invention.

REFERENCE NUMBERS

10. Positive Extractor

20. Die fastening block

21. Fastening flange

211. Fastening parts

30. Die

31. Die block

32. Die hole

40. Head die of various forms

41. Marking die of various forms

42. Marking die of various forms

50. Upper head fastening block

51. Fastening parts

60. Bolt

61. Bolt Head

62. Bolt Shaft

A. Bolt die module

DETAILED DESCRIPTION OF THE INVENTION

In FIG. 1, the positive extractor (10) maintaining press by arrivingupper head connection block (50) of bolt shaft (62) belonging to boltdraft with the force applied on y-axis, bolt die module (A) having themould connection block (20) providing connection of mentioned positiveextractor (10) are figured. In the aforementioned y-axis, die connectionblock (20) centered die hole (32) owning die (30) and brand die (42) invarious forms centered in the upper head connection block (50)maintaining burr-free production while forming and ensuring the shape ofhead in different forms by the pressed bolt shaft (62). Aforementioneddie (30) and different formed head die (40) located between differentforms of brand dies(42) and aforementioned different forms of brand die(42) bolt die module (A) fixing different head formed brand die houses(41) are available. Also, housing level (31) is available for centeringthe aforementioned die (30) with the die connection block (20).

FIG. 1 indicates the perspective view of the bolt die module (A).Positive extractor (10) is available at the bottom of figure thatenables forming of the bolt head (61) by supporting the bolt (60).Positive extractor (10) enters into the die connection (20) and supportsthe bolt (60). Aforementioned die connection block (60) ensuresinter-connection of aforementioned positive extractor (10) and the die(10). Aforementioned die connection block (20) prevents unwantedmovement of the die (30) with the pressure applied by the positiveextractor (10) encapsulated in the die (30) with the connection flange(21). Aforementioned connection flange (21) is fixed to aforementioneddie connection block (20) via fixation elements (211). As indicatedabove, the die (30) holding the bolt shaft (62) belonging to the bolt(60) within the connection flange (21) and die connection block (20).Head die (40) having a design that prevents burr forming while formingbolt head (61) in different head forms is available on the die (30).Head die in different forms (40) consists of different forms of branddie (42) shaping the bolt head (61) in different forms and brand diehouse (41) in different head forms fixing aforementioned different formsof brand die (42) to the bolt die module (A).

FIG. 1 shows the upper head connection block (50) at the upper section.Upper head connection block (50) is fixed via inter-connection elements(51) via different forms of head die (40). Upper head connection block(50) is shaped as the different forms of brand die (42) of bolt (60)with applied press force since different forms of brand dies (42) arelocated on the upper section.

The bolt die module (A) working principle is as follows.

When the operation is initiated, the different forms of brand die (42)connected to bolt die module (A) is moved with downwards direction (Y−)and one end is encapsulated along the downward movement direction (Y−)between the upper head connection block (50) and one end with the boltshaft (62) positive extractor (10) by heating to the forging heat. Bolthead (61) of the bolt (60) with heated one end between different formsof head die (40) and different forms of brand die (42) shall be forgedand formed as burr-free. Through movement of upper head connection block(50) towards backwards direction (Y+), head (61) shall be taken out fromthe die (30) as burr free and left in the case for cooling down.

Production steps burr-free bolt (60) containing the of Bolt die module(A) are as given below.

-   -   placing induction device head side heated steel stick pieces        within the die hole (32) having the same diameter with the        heated steel part at the middle of lower die (30) connected to        friction press table,    -   successively placing steel stick centering die and different        forms of head die (40) as tight-fit in the lower die (30),    -   when the operation is initiated, different forms of head dies        (40) connected to upper table of the press is moved downwards        and encapsulating heated stick with one end heated to forging        temperature with ongoing downwards movement between lower die        and upper die,    -   forming the head die (30) and steel stick with heated one end        between different forms of head die (40) and forging as the        burr-free,    -   upon back upwards movement of the head die (30), taking out the        head forged bolt as burr-free from the die housing and leaving        for cooling down.

1. A positive extractor ensuring pressing of the bolt shaft belonging tothe bolt draft with the force applied on Y-axis after reaching to upperhead connection block, the bolt die module having the die connectionblock enabling connection of aforementioned positive extactor, andcharacterized with; a die having a die hole centered with the dieconnection block on aforementioned y-axis, different forms of brand diecentered within the upper head connection block enabling burr-freeproduction during shaping and enabling forming the pressed bolt shaft indifferent head shape, containing different forms of head die placedbetween different die and different forms of brand die.
 2. A bolt diemodule according to claim 1 and characterized by containing differenthead forms brand die bed fixing the aforementioned different forms ofbrand dies to the bolt die module.
 3. A bolt die module according toclaim 1 and characterized by containing a housing level centering theaforementioned die with the die connection block.
 4. Y-axis appliedforces bolt draft of bolt shaft of the upper head connection blockpositive remover allowing pressed to come, said positive extractorconnection enables fitting mold block with a bolt pattern modulecontaining the burr-freebolt the production method and characterized bythe following steps: placing induction device head side heated steelstick pieces within the die hole having the same diameter with theheated steel part at the middle of lower die connected to friction presstable, successively placing steel stick centering die and differentforms of head die as tight-fit in the lower die, when the operation isinitiated, different forms of head dies connected to upper table of thepress is moved downwards and encapsulating heated stick with one endheated to forging temperature with ongoing downwards movement betweenlower die and upper die, forming the head die and steel stick withheated one end between different forms of head die and forging as theburr-free, upon back upwards movement of the head die, taking out thehead forged bolt as burr-free from the die housing and leaving forcooling down.